Valve for pneumatic-despatch-tube apparatus.



I. w. LITOHFIE LD. 1 VALYE POR PNEUMATIC DESPATOH TUBE APPARATUS.APPLIOAIIIOI PILED'DEO. 20, 1909'.

992,784. Patented May 23, 1911.

71:: NORRIS PETIRs 120.. WASHINGTON, D. c.

- the tube E. The chamber G surrounding UNITED sTA Es PATENT OFFICE.

.ISAAG W. LITCHFIELD, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO LAMSONCONSOLE- DATED'STORE SERVICE COMPANY, OF NEWARK, NEW JERSEY, ACORPORATION OF NEW JERSEY.

VALVE FOR PNEUMATIC-DESPATCH-TUBE APPARATUS.

Specification of Letters Patent.

Patented May 23, 1911.

To all whom it may concern:

Be it known that I, IsAAo W. LITGHFIELD, of Boston, in the county ofSufiolk and State of Massachusetts, have invented certain new and usefulImprovements in Valves for Pneumatic-Despatch-Tube Apparatus, of whichthe following is a specification.

My invention relates to improvements in pneumatic despatch tubeapparatus and particularly to the construction of the valves controllingthe delivery openings of such apparatus.

The object of this invention is to provide means for localizing theimpact of the carrier upon the valve atone point preferably near thevalve seat thereby providing an initial opening for the admission ofair. This initial opening greatly facilitates the opening of the valveby said carrier with reduced retardation of said carrier. This isaccomplished by mounting a small lug or projection on the inner face ofthe valve close to the valve seat and projecting slightly into the mouthof the delivery opening and localizing the point of impact of thecarrier upon the valve.

In the accompanying drawings which illustrate a construction embodyingmy invention: Figure 1 is a side elevation of a terminal with the tubepartly broken away and with the carrier in contact with the lug tolocalize the impact of the carrier. Fig. 2

is a rear elevation of Fig. 1. Fig. 3 is a detail view partly in sectionshowing the valve open and a carrier passing through.

Like letters of reference refer to like parts throughout the severalviews.

The delivery tube A being an extension of the transmission tube isinserted in the casing B which surrounds said tube A and is connectedwith the source of power through the delivery tube A is connected withsaid by rivets Z tolthe inner face of the air valve' f at a point nearthe edge of said valve. The carriers arriving near the delivery openingimpinge upon said lug 74 causing the valve f to be lifted from its seatnearest that point forming an initial opening; the pressure on the valvef quickly equalizes allowing the valve to fully open and the carrier topass through. The angular face on of lug is allows the passage of thecarrier without being retarded by said lug.

J is a suit-able receiver into which carriers are discharged from thetube line.

Having thus described the nature of my invention'and set forth aconstruction embodying the same, what I claim as new and desire tosecure .by Letters Patent of the United States is:

1. In a pneumatic despatch tube apparatus, a terminal, a valvecontrolling the delivery opening of said terminal, a lug mounted on andinclined to the inner level face of said valve and adapted to receivethe impact of a carrier thereon.

2. In a pneumatic despatch tube apparatus, a terminal, a valvecontrolling the delivery opening of said terminal, a lug mounted on andinclined inwardly to the inner level face of said valve and adapted toreceive the impact of a carrier thereon.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses, this 14th day of December A. D.1909.

ISAAC W. LITCHFIELD.

Witnesses:

LOUIS G. BARTLETT, A. L. MESSER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). O.

